Moosup is a village and census-designated place (CDP) in the town of Plainfield, Connecticut in the United States. The population was 3,237 at the 2000 census.
Moosup's claim to fame is that it is the boyhood hometown of Walt Dropo, During a 13-year career in Major League Baseball, he played for the Boston Red Sox (1949–1952), Detroit Tigers (1952–1954), Chicago White Sox (1955–1958), Cincinnati Redlegs (1958–1959) and Baltimore Orioles (1959-1961). Dropo's parents emigrated from Mostar, Yugoslavia (now Bosnia and Herzegovina), to start a new life. His father, Savo, worked at the local textile mill while also running their Connecticut family farm. Walter was raised in Moosup, Connecticut, where he played sandlot baseball with his brothers Milton and George, and attended Plainfield High School in Central Village, Connecticut, before attending the University of Connecticut.
According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (6.1 km2), of which, 2.3 square miles (6.0 km2) of it is land and 0.04 square miles (0.1 km2) of it (0.85%) is water.